TrueToSize

Convert / Shoes

Allbirds to Clarks shoe size

The short answer

Allbirds 5.5 is Clarks 5½ by the two brands' own charts. 6 of 13 Allbirds sizes land on a different label at Clarks.

At least one of the two brands publishes no foot length, so the rows line up the US size both charts print. Treat it as the label conversion, not a fit.

Every Allbirds size read across to Clarks. US women's sizes on the left, US women's on the right.
AllbirdsAllbirds builds it forClarks, by chartSame labelClarks builds it forClarks also prints
5not published5not publishedfoot length 21.6 cmUK 2.5
5.5not published5½not publishedfoot length 22.1 cmUK 3
6not published6not publishedfoot length 22.6 cmUK 3.5
6.5not published6½not publishedfoot length 23.1 cmUK 4
7not published7not publishedfoot length 23.6 cmUK 4.5
7.5not published7½not publishedfoot length 23.9 cmUK 5
8not published8not publishedfoot length 24.1 cmUK 5.5
8.5not published8½not publishedfoot length 24.6 cmUK 6
9not published9not publishedfoot length 25.1 cmUK 6.5
9.5not published9½not publishedfoot length 25.4 cmUK 7
10not published10not publishedfoot length 25.9 cmUK 7.5
10.5not published10½not publishedfoot length 26.2 cmUK 8
11not published11not publishedfoot length 26.7 cmUK 8.5
Tinted rows change label or sit between two sizes. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

Clarks to Allbirds